Now for something different, a Pontiac OHC L6

Because this places needs the occasional new thread, I thought I'd post this here too.

I picked up a 1969 4.1L Pontiac overhead cam inline six. I want a '69 Firebird, and since I have two big block Buick's and a 428 FE powered T-bird I could go smaller with the Firebird. Since I don't have the car yet it means I can spend some time and money on the engine first

For those that don't know, Pontiac made these engines for four years, from the '66 model year to the '69 model year. They made more power than the Chevy straight sixes and ran at least 1,000rpm higher.

So some pictures, if you know the Chevy inline six, some parts will look familar.

The intake/exhaust side.

The MIGHTY one barrel carb :P

A 1969 4.1L Code. The Date code says December 1968.

The accessory side.

What paint scheme to go with eventually?

The accessory block driven by the timing belt. Has the Distributor, Oil and Fuel Pumps.

You can see the slots where it bolts up, it's how the timing belt is tightened.

The Pontiac has a deeper skirt block, surrounding the main caps compared to the chevy for more strength.

Oil's full, engine turns easily. I think I'll pull the distributor, get a drill and test the oil pressure.

Big Ol' Cam Sprocket.

The Accessory drive sprocket.

My plan is to rebuild it for some boosted high rpm action Get the crank perfectly balanced, some light weight forged pistons, aftermarket connecting rods, then make up an intake and exhaust for a turbo and multiport fuel injection.

I've got a Pontiac Sprint 6 engine (OHC 6 with a factory Quadrajet and split exhaust manifolds) that may go into a HAMB-style '64 Biscayne one of these days. I was thinking turbo as well. It'd be fun to whip on some 409s with it.

Keep us posted. I look forward to seeing your build.
--------------------------------460_BBF_Turbo-in-CC (formerly Dr511scj) "This guy has no life other than posting endlessly on carcraft.com." -- Car Craft, July 2005-------October 1, 2003: " I'm thinking a couple of...turbos, blowing through an old Powerstroke intercooler...on a Super Cobra Jet-head 460 would be mad cheap and make sick power." -------"I have no problem with your...talking to several versions of yourself...or pointing out our failure to do a turbo story ...." --Douglas "CC/Rambler" Glad

Idrivejunk, I've owned a 370 h.p. 1969 Grand Prix SJ since 1981. I orginally bought it because it was about $1,000 cheaper than a GTO and it was a sleeper to most of my less knowledgeable cohorts. And it handled better than my old GTO-powered LeMans Sport(which had sustained some body damage).

I keep hoping these alternative muscle cars will catch on some day. They've got a better weight distribution than even a Gen I Monte Carlo (which has more engine setback than a Chevelle, GTO, Skylark, 442 etc.).

Unfortunately, most muscle car books overlook these cars, probably because (1) perceptions of them are tainted by the slow and heavy "smogger" Grand Prixs of the mid '70s; 2) their neo-classic styling doesn't have very many '60s muscle car styling cues; (3) they've got a limited competition heritage.

Still the '69-'70 Grand Prixs (and to a slightly lesser extent, the '71-'72 GPs) remain one of the best values in "overlooked" muscle.
--------------------------------460_BBF_Turbo-in-CC (formerly Dr511scj) "This guy has no life other than posting endlessly on carcraft.com." -- Car Craft, July 2005-------October 1, 2003: " I'm thinking a couple of...turbos, blowing through an old Powerstroke intercooler...on a Super Cobra Jet-head 460 would be mad cheap and make sick power." -------"I have no problem with your...talking to several versions of yourself...or pointing out our failure to do a turbo story ...." --Douglas "CC/Rambler" Glad

I'm working on getting the engine to my basement for disassembly. It is currently residing at the top of my basement stairs and I hope to have it in the basement tonight.
-The Silver Buick- '77 Skylark coupe w/ a Fuel Injected Buick 455&TKO-600, '72 Centurion Conv't - 455w/TH400, '67 T-bird 4Dr (suicide) w/428&C6. '69 Firebird replaced!

ERIK427:Bolt on a side mounted Roots style blower. Also, I bet you could find all kinds of bore and stroke combos. Maybe a stroker motor?

LMAO! I did this as a joke, but rest assured it'll be turbo'd before all is done. I also have a 292 crank to try in it. But I've been chatting with folks who spin their small block chevy's to 8100+rpm and it sounds like I may have an issue with stroke and cylinder filling if I want to see those, and then some, rpm. Though boosted is a bit different beast. I'll be test fitting the 292 crank anyways.